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The Bicycle Model & the Understeer Gradient

Inside this lesson
  • Set up the two-degree-of-freedom bicycle model
  • Derive the understeer gradient K from mass, CG position, and cornering stiffnesses
  • Classify a vehicle as neutral/understeer/oversteer from the sign of K
  • Interpret steady-state yaw-rate and sideslip response to a steer input

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Educational content covering topics typical of a first- and second-year automotive engineering curriculum. Not a substitute for accredited coursework, and not suitable for real vehicle design, operation, regulation, or safety decisions without review by a licensed professional engineer. References to WLTP/EPA test cycles, ISO 26262, NCAP/IIHS, or SAE levels are descriptive context only, not compliance, certification, or capability guidance.